Bench-dog.



PAT-ENTED APR. 26, 1904" J. H. BBLSER:

BENCH DOG. APPLICATION IIL ED JAN. 21, 1904 N0 IODEL.

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Q vitneoaeo co. PHDYMlYb-Kl, wnsumarou n c j No. 758,407.

Patented April 26, 1904.

PATENT OFFICE.

JAMES H. BELSER, OF MARLBORO, MASSACHUSETTS.

BENCH-DOG- SPECIFICATION forming part of Letters Patent No. 758,407,dated April 26, 1904.

Application filed January 21, 1904. Serial No. 189,993- (No model.)

To all whom it may concern.-

Be it known that I, JAMns H. BELSER, of Marlboro, county of Middlesex,and State of Massachusetts, have invented certain new and usefulImprovements in Bench-Dogs; and I do hereby declare the following to bea full and clear description thereof.

My invention relates to bench-dogs or benchsets.

Figure 1 represents a side view of the device to which my improvementhas been attached. Fig. 2 is a plan view. Fig. 3 is a longitudinalvertical section. Fig. i is a side elevation of the dog and its shank,and Fig. 5 is a view of the tapering adjusting-bolt.

The invention consists in the following construction and combination ofparts, the details of which will first be described and the features ofnovelty then set forth in the claims.

The device comprises the usual outer casing 1, provided with the upperflange 2, both of which are generally adapted to be mortised into aworkmans bench. The upper flange 2 has a depressed recess 3, withinwhich the dog or set 4: proper is adapted to be received. The dog 4 isprovided with a shank 5, which is longitudinally and radially slotted at6 for the purpose of forming an expanding section adapted to biteagainst the inner shell of the casing 1. This shank is provided ,withacollar projection 7 and the casing with a similar collar projection 8,between which, surrounding the shank, is located a coiled spring 9. Theinterior of the shank 5, carrying the dog 4, is provided with alongitudinal central opening 10, the lower end 11 of which is ta-.

per-choked and threaded. Within this central opening takes the adjustingand locking bolt 12, the lower end of the bolt being provided with atapering thread extending to the choked portion of the shank 5. Byloosening the bolt 12, which is preferably provided with a screw-head,the bolt is withdrawn from the choked portion of the shank and thespring 9 acts to throw the dog 4; upwardly. The dog may be adjustablyset at any vertical height by simply depressing the samev and screwingthe bolt 12 until it forces the slotted end of the shank 5 outwardly,extending it against the inner shell of the casing 1, thereby "securelylocking the dog in position.

Of course the device may be made in any proportion to give any variedadjustment. In Fig. 2the dog is shown provided with four dilferentclamping-faces adapted for difierent kinds of work.

Upon loosening the bolt 12 the spring throws the dog upwardly, when thesquare portion of the shank 13 may be lifted out of the casing androtated so as to bring any one of the four faces of the dog 4: intooperative position.

This bench-dog is a marked improvement over those heretofore used. Thelocking-adjustment is positive and will not become loose undersuccessive vibrations to which this class of tool is subjected. Many ofthe bench-dogs now in use are open to this objection.

I claim- V 1. In a bench-dog the combination of a casing provided with aflange having a recess, a hollow shank provided with a dog at its upperend and at its lower end with a series of radial slots and ataper-choked bore, a bolt within the bore of the shank having acorresponding taper for extending the radial sections of the shank, anda spring interposed between the shank and the casing.

2. In a bench-dog the combination of a casing having an angular recess,a hollow shank movable therein having a portion thereof angularly shapedin cross section and a dog at the top thereof having a series ofengaging faces and a locking-bolt within the shank and concentrictherewith, the shank adapted to be

